Quotas related to queues

The following table lists quotas related to queues.

Quota	Description
Delay queue	The default (minimum) delay for a queue is 0 seconds. The maximum is 15 minutes.
Listed queues	1,000 queues per ListQueues request.
Long polling wait time	The maximum long polling wait time is 20 seconds.
Message groups	There is no quota to the number of message groups within a FIFO queue.
Messages per queue (backlog)	The number of messages that an Amazon SQS queue can store is unlimited.
Messages per queue (in flight)	For most standard queues (depending on queue traffic and message backlog), there can be a maximum of approximately 120,000 inflight messages (received from a queue by a consumer, but not yet deleted from the queue). If you reach this quota while using short polling, Amazon SQS returns the OverLimit error message. If you use long polling, Amazon SQS returns no error messages. To avoid reaching the quota, you should delete messages from the queue after they're processed. You can also increase the number of queues you use to process your messages. To request a quota increase, submit a support request.
	For FIFO queues, there can be a maximum of 20,000 inflight messages (received from a queue by a consumer, but not yet deleted from the queue). If you reach this quota, Amazon SQS returns no error messages.
Queue name	A queue name can have up to 80 characters. The following characters are accepted: alphanumeric characters, hyphens (-), and underscores (_). Note Queue names are case-sensitive (for example, Test-queue and test-queue are different queues).
	The name of a FIFO queue must end with the .fifo suffix. The suffix counts towards the 80-character queue name quota. To determine whether a queue is FIFO, you can check whether the queue name ends with the suffix.
Queue tag	We don't recommend adding more than 50 tags to a queue.
	The tag Key is required, but the tag Value is optional.
	The tag Key and tag Value are case-sensitive.
	The tag Key and tag Value can include Unicode alphanumeric characters in UTF-8 and whitespaces. The following special characters are allowed: _ . : / = + - @
	The tag Key or Value must not include the reserved prefix aws: (you can't delete tag keys or values with this prefix).
	The maximum tag Key length is 128 Unicode characters in UTF-8. The tag Key must not be empty or null.
	The maximum tag Value length is 256 Unicode characters in UTF-8. The tag Value may be empty or null.
	Tagging actions are limited to 5 TPS per AWS account. If your application requires a higher throughput, submit a request.